Class information for:
Level 1: ATOMIC CLOCKS//OPTICAL FREQUENCY STANDARD//LNE SYRTE

Basic class information
Class id #P Avg. number of
references		 Database coverage
of references
4817 1720 26.4 70%


Bar chart of Publication_year

Last years might be incomplete

Hierarchy of classes
The table includes all classes above and classes immediately below the current class.


Cluster id Level Cluster label #P
10 4 OPTICS//PHYSICS, PARTICLES & FIELDS//PHYSICS, MULTIDISCIPLINARY 1131262
194 3       PHYSICAL REVIEW A//OPTICS//PHYSICS, ATOMIC, MOLECULAR & CHEMICAL 54094
146 2             PHYSICAL REVIEW A//ELECTROMAGNETICALLY INDUCED TRANSPARENCY//OPTICS 23279
4817 1                   ATOMIC CLOCKS//OPTICAL FREQUENCY STANDARD//LNE SYRTE 1720

Terms with highest relevance score


rank Term termType Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class
1 ATOMIC CLOCKS authKW 373636 3% 35% 60
2 OPTICAL FREQUENCY STANDARD authKW 312557 2% 46% 38
3 LNE SYRTE address 296308 3% 35% 48
4 OPTICAL LATTICE CLOCK authKW 248519 1% 100% 14
5 FREQUENCY STANDARD authKW 241378 2% 40% 34
6 OPTICAL CLOCK authKW 232360 1% 55% 24
7 INNOVAT SPACE TIME PROJECT address 217451 1% 88% 14
8 ATOMIC FOUNTAIN authKW 193287 1% 78% 14
9 TIME FREQUENCY address 171513 4% 15% 65
10 OPTICAL ATOMIC CLOCKS authKW 159762 1% 100% 9

Web of Science journal categories


Rank Term Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class
1 Optics 17671 42% 0% 727
2 Instruments & Instrumentation 5515 18% 0% 314
3 Physics, Multidisciplinary 4928 25% 0% 438
4 Physics, Atomic, Molecular & Chemical 4027 20% 0% 342
5 Physics, Applied 1850 23% 0% 398
6 Acoustics 1009 5% 0% 84
7 Engineering, Electrical & Electronic 924 16% 0% 271
8 Engineering, General 24 1% 0% 25
9 Astronomy & Astrophysics 0 2% 0% 31
10 Engineering, Aerospace 0 0% 0% 5

Address terms


Rank Term Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class
1 LNE SYRTE 296308 3% 35% 48
2 INNOVAT SPACE TIME PROJECT 217451 1% 88% 14
3 TIME FREQUENCY 171513 4% 15% 65
4 HORLOGE ATOM 149990 1% 65% 13
5 METROL TIME SPACE 134238 1% 69% 11
6 METROL ESSAIS SYST REFERENCES TEMPS ES 130711 1% 82% 9
7 JOINT MEASUREMENT SCI 82443 1% 39% 12
8 OBSERV PARISUMR 8630 71006 0% 100% 4
9 ATOM FREQUENCY STAND 66889 1% 27% 14
10 QUANTUM METROL 49139 1% 23% 12

Journals


Rank Term Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class
1 METROLOGIA 69314 6% 4% 104
2 IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 29685 7% 1% 122
3 IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL 22497 5% 2% 84
4 PHYSICAL REVIEW A 18825 15% 0% 266
5 PTB-MITTEILUNGEN 9306 1% 4% 12
6 APPLIED PHYSICS B-LASERS AND OPTICS 9033 4% 1% 62
7 OPTICS LETTERS 4041 5% 0% 83
8 PHYSICAL REVIEW LETTERS 3941 9% 0% 148
9 CHINESE PHYSICS LETTERS 3367 3% 0% 54
10 NATURE PHOTONICS 3292 1% 1% 14

Author Key Words


Rank Term Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class		 LCSH search Wikipedia search
1 ATOMIC CLOCKS 373636 3% 35% 60 Search ATOMIC+CLOCKS Search ATOMIC+CLOCKS
2 OPTICAL FREQUENCY STANDARD 312557 2% 46% 38 Search OPTICAL+FREQUENCY+STANDARD Search OPTICAL+FREQUENCY+STANDARD
3 OPTICAL LATTICE CLOCK 248519 1% 100% 14 Search OPTICAL+LATTICE+CLOCK Search OPTICAL+LATTICE+CLOCK
4 FREQUENCY STANDARD 241378 2% 40% 34 Search FREQUENCY+STANDARD Search FREQUENCY+STANDARD
5 OPTICAL CLOCK 232360 1% 55% 24 Search OPTICAL+CLOCK Search OPTICAL+CLOCK
6 ATOMIC FOUNTAIN 193287 1% 78% 14 Search ATOMIC+FOUNTAIN Search ATOMIC+FOUNTAIN
7 OPTICAL ATOMIC CLOCKS 159762 1% 100% 9 Search OPTICAL+ATOMIC+CLOCKS Search OPTICAL+ATOMIC+CLOCKS
8 PRIMARY FREQUENCY STANDARD 126230 0% 89% 8 Search PRIMARY+FREQUENCY+STANDARD Search PRIMARY+FREQUENCY+STANDARD
9 FREQUENCY TRANSFER 110599 1% 69% 9 Search FREQUENCY+TRANSFER Search FREQUENCY+TRANSFER
10 CESIUM BEAM FREQUENCY STANDARD 106508 0% 100% 6 Search CESIUM+BEAM+FREQUENCY+STANDARD Search CESIUM+BEAM+FREQUENCY+STANDARD

Core articles
The table includes core articles in the class. The following variables is taken into account for the relevance score of an article in a cluster c:
(1) Number of references referring to publications in the class.
(2) Share of total number of active references referring to publications in the class.
(3) Age of the article. New articles get higher score than old articles.
(4) Citation rate, normalized to year.


Rank Reference # ref. in
cl.		 Shr. of ref. in
cl.		 Citations
1 LUDLOW, AD , BOYD, MM , YE, J , PEIK, E , SCHMIDT, PO , (2015) OPTICAL ATOMIC CLOCKS.REVIEWS OF MODERN PHYSICS. VOL. 87. ISSUE 2. P. 637 -701 253 52% 115
2 POLI, N , OATES, CW , GILL, P , TINO, GM , (2013) OPTICAL ATOMIC CLOCKS.RIVISTA DEL NUOVO CIMENTO. VOL. 36. ISSUE 12. P. 555 -624 131 67% 22
3 BLOOM, BJ , NICHOLSON, TL , WILLIAMS, JR , CAMPBELL, SL , BISHOF, M , ZHANG, X , ZHANG, W , BROMLEY, SL , YE, J , (2014) AN OPTICAL LATTICE CLOCK WITH ACCURACY AND STABILITY AT THE 10(-18) LEVEL.NATURE. VOL. 506. ISSUE 7486. P. 71-+ 31 89% 305
4 FALKE, S , LEMKE, N , GREBING, C , LIPPHARDT, B , WEYERS, S , GERGINOV, V , HUNTEMANN, N , HAGEMANN, C , AL-MASOUDI, A , HAFNER, S , ET AL (2014) A STRONTIUM LATTICE CLOCK WITH 3 X 10(-17) INACCURACY AND ITS FREQUENCY.NEW JOURNAL OF PHYSICS. VOL. 16. ISSUE . P. - 51 89% 51
5 USHIJIMA, I , TAKAMOTO, M , DAS, M , OHKUBO, T , KATORI, H , (2015) CRYOGENIC OPTICAL LATTICE CLOCKS.NATURE PHOTONICS. VOL. 9. ISSUE 3. P. 185 -189 28 93% 124
6 NICHOLSON, TL , CAMPBELL, SL , HUTSON, RB , MARTI, GE , BLOOM, BJ , MCNALLY, RL , ZHANG, W , BARRETT, MD , SAFRONOVA, MS , STROUSE, GF , ET AL (2015) SYSTEMATIC EVALUATION OF AN ATOMIC CLOCK AT 2 X 10 (-18) TOTAL UNCERTAINTY.NATURE COMMUNICATIONS. VOL. 6. ISSUE . P. - 34 77% 106
7 KATORI, H , (2011) OPTICAL LATTICE CLOCKS AND QUANTUM METROLOGY.NATURE PHOTONICS. VOL. 5. ISSUE 4. P. 203 -210 66 70% 87
8 GUENA, J , ABGRALL, M , ROVERA, D , LAURENT, P , CHUPIN, B , LOURS, M , SANTARELLI, G , ROSENBUSCH, P , TOBAR, ME , LI, RX , ET AL (2012) PROGRESS IN ATOMIC FOUNTAINS AT LNE-SYRTE.IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL. VOL. 59. ISSUE 3. P. 391 -410 63 66% 96
9 DEREVIANKO, A , KATORI, H , (2011) COLLOQUIUM: PHYSICS OF OPTICAL LATTICE CLOCKS.REVIEWS OF MODERN PHYSICS. VOL. 83. ISSUE 2. P. - 65 71% 77
10 LOPEZ, O , KEFELIAN, F , JIANG, HF , HABOUCHA, A , BERCY, A , STEFANI, F , CHANTEAU, B , KANJ, A , ROVERA, D , ACHKAR, J , ET AL (2015) FREQUENCY AND TIME TRANSFER FOR METROLOGY AND BEYOND USING TELECOMMUNICATION NETWORK FIBRES.COMPTES RENDUS PHYSIQUE. VOL. 16. ISSUE 5. P. 531 -539 55 87% 6

Classes with closest relation at Level 1


Rank Class id link
1 29947 COLOR SELECTIVE MOTT TRANSITION//COLOR SUPERFLUID//ALKALINE EARTH COLD FERMION
2 7034 FREQUENCY COMB//OPTICAL FREQUENCY COMB//OPTICAL FREQUENCY METROLOGY
3 21602 ALLAN VARIATION//FREQUENCY JUMPS//SIMPLE RESPONSE METHOD
4 2484 ATOM LITHOGRAPHY//MAGNETO OPTICAL TRAP//LASER COOLING
5 7146 NONACCELERATOR PARTICLE PHYS GRP//FRANCIUM//NON ACCELERATOR PARTICLE PHYS GRP
6 11509 FINE STRUCTURE CONSTANT//VARIATION OF FUNDAMENTAL CONSTANTS//FUNDAMENTAL COUPLINGS
7 2485 TRAPPED IONS//ION TRAP//ULTRACOLD ATOMS
8 8633 ATOM INTERFEROMETRY//ATOM INTERFEROMETER//VCQ
9 12514 SATURATED ABSORPTION SPECTROSCOPY//ACOUSTOOPTIC SWITCHES//FREQUENCY STABILIZATION
10 8931 MODULATION TRANSFER SPECTROSCOPY//OPTICAL FREQUENCY STANDARD//FREQUENCY STABILIZATION

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